/*
 * Copyright (c) 2006, 2023, webrx.cn All rights reserved.
 *
 */
package cn.ex;

/**
 * <p>Project: jse2302 - Book
 * <p>Powered by webrx On 2023-06-16 09:49:25
 * <p>Created by IntelliJ IDEA
 *
 * @author  webrx [webrx@126.com]
 * @version 1.0
 * @since 17
 */
public abstract class Book {
    public static int pf(int i) {
        return i * i;
    }

    public abstract int lf(int i);


    public static void main(String[] args) {
        System.out.println(Book.pf(3));
        //System.out.println("hello world");
    }
}
